[PATCH] finally get rid of nameidata in namespace.c

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

diff --git a/fs/namespace.c b/fs/namespace.c
index 6e283c9..9f6005e 100644 (file)
--- a/fs/namespace.c
+++ b/fs/namespace.c
@@ -1167,19 +1167,19 @@ asmlinkage long sys_oldumount(char __user * name)
 
 #endif
 
-static int mount_is_safe(struct nameidata *nd)
+static int mount_is_safe(struct path *path)
 {
        if (capable(CAP_SYS_ADMIN))
                return 0;
        return -EPERM;
 #ifdef notyet
-       if (S_ISLNK(nd->path.dentry->d_inode->i_mode))
+       if (S_ISLNK(path->dentry->d_inode->i_mode))
                return -EPERM;
-       if (nd->path.dentry->d_inode->i_mode & S_ISVTX) {
-               if (current->uid != nd->path.dentry->d_inode->i_uid)
+       if (path->dentry->d_inode->i_mode & S_ISVTX) {
+               if (current->uid != path->dentry->d_inode->i_uid)
                        return -EPERM;
        }
-       if (vfs_permission(nd, MAY_WRITE))
+       if (inode_permission(path->dentry->d_inode, MAY_WRITE))
                return -EPERM;
        return 0;
 #endif
@@ -1427,9 +1427,9 @@ out_unlock:
  * recursively change the type of the mountpoint.
  * noinline this do_mount helper to save do_mount stack space.
  */
-static noinline int do_change_type(struct nameidata *nd, int flag)
+static noinline int do_change_type(struct path *path, int flag)
 {
-       struct vfsmount *m, *mnt = nd->path.mnt;
+       struct vfsmount *m, *mnt = path->mnt;
        int recurse = flag & MS_REC;
        int type = flag & ~MS_REC;
        int err = 0;
@@ -1437,7 +1437,7 @@ static noinline int do_change_type(struct nameidata *nd, int flag)
        if (!capable(CAP_SYS_ADMIN))
                return -EPERM;
 
-       if (nd->path.dentry != nd->path.mnt->mnt_root)
+       if (path->dentry != path->mnt->mnt_root)
                return -EINVAL;
 
        down_write(&namespace_sem);
@@ -1461,38 +1461,38 @@ static noinline int do_change_type(struct nameidata *nd, int flag)
  * do loopback mount.
  * noinline this do_mount helper to save do_mount stack space.
  */
-static noinline int do_loopback(struct nameidata *nd, char *old_name,
+static noinline int do_loopback(struct path *path, char *old_name,
                                int recurse)
 {
-       struct nameidata old_nd;
+       struct path old_path;
        struct vfsmount *mnt = NULL;
-       int err = mount_is_safe(nd);
+       int err = mount_is_safe(path);
        if (err)
                return err;
        if (!old_name || !*old_name)
                return -EINVAL;
-       err = path_lookup(old_name, LOOKUP_FOLLOW, &old_nd);
+       err = kern_path(old_name, LOOKUP_FOLLOW, &old_path);
        if (err)
                return err;
 
        down_write(&namespace_sem);
        err = -EINVAL;
-       if (IS_MNT_UNBINDABLE(old_nd.path.mnt))
+       if (IS_MNT_UNBINDABLE(old_path.mnt))
                goto out;
 
-       if (!check_mnt(nd->path.mnt) || !check_mnt(old_nd.path.mnt))
+       if (!check_mnt(path->mnt) || !check_mnt(old_path.mnt))
                goto out;
 
        err = -ENOMEM;
        if (recurse)
-               mnt = copy_tree(old_nd.path.mnt, old_nd.path.dentry, 0);
+               mnt = copy_tree(old_path.mnt, old_path.dentry, 0);
        else
-               mnt = clone_mnt(old_nd.path.mnt, old_nd.path.dentry, 0);
+               mnt = clone_mnt(old_path.mnt, old_path.dentry, 0);
 
        if (!mnt)
                goto out;
 
-       err = graft_tree(mnt, &nd->path);
+       err = graft_tree(mnt, path);
        if (err) {
                LIST_HEAD(umount_list);
                spin_lock(&vfsmount_lock);
@@ -1503,7 +1503,7 @@ static noinline int do_loopback(struct nameidata *nd, char *old_name,
 
 out:
        up_write(&namespace_sem);
-       path_put(&old_nd.path);
+       path_put(&old_path);
        return err;
 }
 
@@ -1530,31 +1530,31 @@ static int change_mount_flags(struct vfsmount *mnt, int ms_flags)
  * on it - tough luck.
  * noinline this do_mount helper to save do_mount stack space.
  */
-static noinline int do_remount(struct nameidata *nd, int flags, int mnt_flags,
+static noinline int do_remount(struct path *path, int flags, int mnt_flags,
                      void *data)
 {
        int err;
-       struct super_block *sb = nd->path.mnt->mnt_sb;
+       struct super_block *sb = path->mnt->mnt_sb;
 
        if (!capable(CAP_SYS_ADMIN))
                return -EPERM;
 
-       if (!check_mnt(nd->path.mnt))
+       if (!check_mnt(path->mnt))
                return -EINVAL;
 
-       if (nd->path.dentry != nd->path.mnt->mnt_root)
+       if (path->dentry != path->mnt->mnt_root)
                return -EINVAL;
 
        down_write(&sb->s_umount);
        if (flags & MS_BIND)
-               err = change_mount_flags(nd->path.mnt, flags);
+               err = change_mount_flags(path->mnt, flags);
        else
                err = do_remount_sb(sb, flags, data, 0);
        if (!err)
-               nd->path.mnt->mnt_flags = mnt_flags;
+               path->mnt->mnt_flags = mnt_flags;
        up_write(&sb->s_umount);
        if (!err)
-               security_sb_post_remount(nd->path.mnt, flags, data);
+               security_sb_post_remount(path->mnt, flags, data);
        return err;
 }
 
@@ -1571,78 +1571,77 @@ static inline int tree_contains_unbindable(struct vfsmount *mnt)
 /*
  * noinline this do_mount helper to save do_mount stack space.
  */
-static noinline int do_move_mount(struct nameidata *nd, char *old_name)
+static noinline int do_move_mount(struct path *path, char *old_name)
 {
-       struct nameidata old_nd;
-       struct path parent_path;
+       struct path old_path, parent_path;
        struct vfsmount *p;
        int err = 0;
        if (!capable(CAP_SYS_ADMIN))
                return -EPERM;
        if (!old_name || !*old_name)
                return -EINVAL;
-       err = path_lookup(old_name, LOOKUP_FOLLOW, &old_nd);
+       err = kern_path(old_name, LOOKUP_FOLLOW, &old_path);
        if (err)
                return err;
 
        down_write(&namespace_sem);
-       while (d_mountpoint(nd->path.dentry) &&
-              follow_down(&nd->path.mnt, &nd->path.dentry))
+       while (d_mountpoint(path->dentry) &&
+              follow_down(&path->mnt, &path->dentry))
                ;
        err = -EINVAL;
-       if (!check_mnt(nd->path.mnt) || !check_mnt(old_nd.path.mnt))
+       if (!check_mnt(path->mnt) || !check_mnt(old_path.mnt))
                goto out;
 
        err = -ENOENT;
-       mutex_lock(&nd->path.dentry->d_inode->i_mutex);
-       if (IS_DEADDIR(nd->path.dentry->d_inode))
+       mutex_lock(&path->dentry->d_inode->i_mutex);
+       if (IS_DEADDIR(path->dentry->d_inode))
                goto out1;
 
-       if (!IS_ROOT(nd->path.dentry) && d_unhashed(nd->path.dentry))
+       if (!IS_ROOT(path->dentry) && d_unhashed(path->dentry))
                goto out1;
 
        err = -EINVAL;
-       if (old_nd.path.dentry != old_nd.path.mnt->mnt_root)
+       if (old_path.dentry != old_path.mnt->mnt_root)
                goto out1;
 
-       if (old_nd.path.mnt == old_nd.path.mnt->mnt_parent)
+       if (old_path.mnt == old_path.mnt->mnt_parent)
                goto out1;
 
-       if (S_ISDIR(nd->path.dentry->d_inode->i_mode) !=
-             S_ISDIR(old_nd.path.dentry->d_inode->i_mode))
+       if (S_ISDIR(path->dentry->d_inode->i_mode) !=
+             S_ISDIR(old_path.dentry->d_inode->i_mode))
                goto out1;
        /*
         * Don't move a mount residing in a shared parent.
         */
-       if (old_nd.path.mnt->mnt_parent &&
-           IS_MNT_SHARED(old_nd.path.mnt->mnt_parent))
+       if (old_path.mnt->mnt_parent &&
+           IS_MNT_SHARED(old_path.mnt->mnt_parent))
                goto out1;
        /*
         * Don't move a mount tree containing unbindable mounts to a destination
         * mount which is shared.
         */
-       if (IS_MNT_SHARED(nd->path.mnt) &&
-           tree_contains_unbindable(old_nd.path.mnt))
+       if (IS_MNT_SHARED(path->mnt) &&
+           tree_contains_unbindable(old_path.mnt))
                goto out1;
        err = -ELOOP;
-       for (p = nd->path.mnt; p->mnt_parent != p; p = p->mnt_parent)
-               if (p == old_nd.path.mnt)
+       for (p = path->mnt; p->mnt_parent != p; p = p->mnt_parent)
+               if (p == old_path.mnt)
                        goto out1;
 
-       err = attach_recursive_mnt(old_nd.path.mnt, &nd->path, &parent_path);
+       err = attach_recursive_mnt(old_path.mnt, path, &parent_path);
        if (err)
                goto out1;
 
        /* if the mount is moved, it should no longer be expire
         * automatically */
-       list_del_init(&old_nd.path.mnt->mnt_expire);
+       list_del_init(&old_path.mnt->mnt_expire);
 out1:
-       mutex_unlock(&nd->path.dentry->d_inode->i_mutex);
+       mutex_unlock(&path->dentry->d_inode->i_mutex);
 out:
        up_write(&namespace_sem);
        if (!err)
                path_put(&parent_path);
-       path_put(&old_nd.path);
+       path_put(&old_path);
        return err;
 }
 
@@ -1651,7 +1650,7 @@ out:
  * namespace's tree
  * noinline this do_mount helper to save do_mount stack space.
  */
-static noinline int do_new_mount(struct nameidata *nd, char *type, int flags,
+static noinline int do_new_mount(struct path *path, char *type, int flags,
                        int mnt_flags, char *name, void *data)
 {
        struct vfsmount *mnt;
@@ -1667,7 +1666,7 @@ static noinline int do_new_mount(struct nameidata *nd, char *type, int flags,
        if (IS_ERR(mnt))
                return PTR_ERR(mnt);
 
-       return do_add_mount(mnt, &nd->path, mnt_flags, NULL);
+       return do_add_mount(mnt, path, mnt_flags, NULL);
 }
 
 /*
@@ -1902,7 +1901,7 @@ int copy_mount_options(const void __user * data, unsigned long *where)
 long do_mount(char *dev_name, char *dir_name, char *type_page,
                  unsigned long flags, void *data_page)
 {
-       struct nameidata nd;
+       struct path path;
        int retval = 0;
        int mnt_flags = 0;
 
@@ -1940,29 +1939,29 @@ long do_mount(char *dev_name, char *dir_name, char *type_page,
                   MS_NOATIME | MS_NODIRATIME | MS_RELATIME| MS_KERNMOUNT);
 
        /* ... and get the mountpoint */
-       retval = path_lookup(dir_name, LOOKUP_FOLLOW, &nd);
+       retval = kern_path(dir_name, LOOKUP_FOLLOW, &path);
        if (retval)
                return retval;
 
-       retval = security_sb_mount(dev_name, &nd.path,
+       retval = security_sb_mount(dev_name, &path,
                                   type_page, flags, data_page);
        if (retval)
                goto dput_out;
 
        if (flags & MS_REMOUNT)
-               retval = do_remount(&nd, flags & ~MS_REMOUNT, mnt_flags,
+               retval = do_remount(&path, flags & ~MS_REMOUNT, mnt_flags,
                                    data_page);
        else if (flags & MS_BIND)
-               retval = do_loopback(&nd, dev_name, flags & MS_REC);
+               retval = do_loopback(&path, dev_name, flags & MS_REC);
        else if (flags & (MS_SHARED | MS_PRIVATE | MS_SLAVE | MS_UNBINDABLE))
-               retval = do_change_type(&nd, flags);
+               retval = do_change_type(&path, flags);
        else if (flags & MS_MOVE)
-               retval = do_move_mount(&nd, dev_name);
+               retval = do_move_mount(&path, dev_name);
        else
-               retval = do_new_mount(&nd, type_page, flags, mnt_flags,
+               retval = do_new_mount(&path, type_page, flags, mnt_flags,
                                      dev_name, data_page);
 dput_out:
-       path_put(&nd.path);
+       path_put(&path);
        return retval;
 }